Natural White Colorless Sapphire

White colorless sapphires are a great precious-stone alternative to diamonds! Next to diamond, sapphire and ruby (both corundum) is the hardest mineral known and is very compact and dense, with no cleavage. As a result, sapphires and rubies are tough and relatively scratch-resistant. That’s why, in addition to their beauty, sapphires and rubies are two of the best jewelry stones.